Automatic steam-pipe-isolating valve.



LLULL. AUTOMATIC STEAM PIPE .ISOLATING VALVE.

APPLICATION P ILBD SEPT. 7, 1912.

Patented Feb. 24, 1914,

vthe starting.

UNITED STATES- PATENT l onirica.

JAKoB 1.61.1., or HoMBEnGfEssENBERG, GERMANY.

AUTOMATIC STEAM-'PIPE-ISOLATING VAIZIV'E..

Specication of Letters Patent.' I Patented Fb,24, 1.914.

Appl'ication filed September 7, 1912. Serial No. 719,205.

To all whom it may concern: V Be it known that I, J Akon LLL, a subjectof the Emperor of Germany, residing at Homberg-Essenb'erg,y -Germany,have vin-v vented an Automatic Steam-Pipe-Isolating Valve, of which thefollowing is .aspecication. e f

The present invention relates to a device for isolatingthe steam pipeautomaticallyv from the boiler in case of a breakage. u

The invention consists in the provision'in the pipe of a lift valveadapted by spring pressure to be normally closed in opposition to thesteam pressure. This valve is adapted to beheld in open position apiston which is acted upon by the pressure normally prevailing at thedischarge side of the valve. If' the pressure should be lowered by abreakage of the pipe, the piston immediately allows the valve to close.An addi-y tional piston, acted upon by the pressure prevailing at theinlet side 'of the valve, is provided for opening the valve initially toset the steam flowing through the pipe.

In the accompanying drawings the inven tion is illustrated, Figurelrepresenting a longitudinal section of the device,.-Fig. 2, a sectionof the same showing the position of the elements when starting, and Fig.'3, a sectional view showing the position after A lift valve b visseated in the vvalve casing a and provided with-lasten@ -cguided througha cover plate d and-a second plate e. A spring f, encirclingy said stem,1s adapted to maintain said valve normally closed in opposition to thehighest prevail,

f .ing steam pressure. At opposite sides of the valve stem closedcylinders g and h are arranged in which move pistons c' and 7cY the rodsof which areguided through the plate e and connected with each other'bya` cross l baum-which is passed through a slot inthe valve jstem.l Saidbar m ismounted in such a manner in the three elements as-to be able toassume the slanting positions shown in Figs. 2 and 3.v Springs Zencircle the two piston rods labove the plate l@which springs merely actas uers and prevent the pistons from descending below the position shownin Fig. 1. The steam pipes n and o .communicate with the cylinders g andh, beneath the pistons, by means of branches p and g each of which isprovided with a cock (pli, g1)V the branchp being also fitted vwith ."awhistle r which is sounded while the cock p2? is open.

TheJ modus operandi is as followsz-In order tolift the valve b, whichthe steam lpressure alone isy incapable of doing, the `cockplv 1s'openedcausing the steam to enl, ter beneath the piston z'. The surfaceof this Vpiston being larger than that of the valve Z2,

the piston is raised, the cross-bar m assumes the slanting positionshowninFig. 2, the kvalve Z is lifted, and the steam is set iowing'through the pipe. Thereupon the cock g1. is

opened whereby the steam is Y. permitted tov enter the'cylinder hbeneath the piston 7c, raising 'the' latter. Thesize of the piston':

being maintained in open position even if the. steam pressure beunstable. As soon as ythepiston 7c is raised the cockp1 should be closedwhereupon the pistonI descends to the position-shown in Fig. 3. In orderto prevent the cock p ffrom being left open inadvertently, the whistle'1j soundsy all the While thefcock is open. During the undisturbedworking ,the position of the device shownin Fig. 3-is maintained. If abreakage -in the pipe should occur, ythe colisequently failing steampressure beneath thev pistonsk will immediately allow said piston todescend. By the action of the spring f the valve I) isforced into itsseat and the` flow of steam cut off. For closing the valve v steampressure, two elo-sed' cylinders arranged at opposite sides .of thevalve stem, pistons arranged respectively in said cylinhold it normallyclosed in opposition to the ders, guide rods connectedy to said pistonsand held together with the valve stem in a common plane, a cross-barconnecting the rods and the stem so that the valve is opened therebywhen either of the pistons is raised in its cylinder, and means forsetting one of said cylinders temporarily into communication With thesteam pipe at the inlet side of vthe valve so as to raise its piston foropening 70 is chosen with a view to insure the valve b said valve, theother cylinder being in communication with the pipe at the dischargeside of the valve and its piston being adapted to be raised by thepressure and to hold the valveropen as long as the. pipe is intact andallow it to close if the pipe should break.

2. An automatic steam pipe isolating valve, comprising alift valveguided by a stem, a spring actingvon said valve so as to hold itnormally closed in opposition to the steam pressure, a closed cylindercommunieating with the steam pipe at the inlet side of the valve, apiston arranged in said cylin der and connected to the valve so as toopen the latter when acted upon by the pressure, another cylindercommunicating with the Vpipe at the discharge side of the Avalve, a

piston in the latter cylinder connected with the valve so as to retainthe latter in open p0- sition under the influence of the pressure as 2olong as the pipe is intact and allow it to close if the pipe breaks,means for interru ting the communications between the pipe and thecylinders, and a Whistle arranged so as to be sounded as long as thefirst-men- 25 tioned cylinder is in communication withI the pipe,substantially as and for the pur-

